Core for casting molds



April 28, 1925. 1,535,186

J. T. STONEY CORE FOR CASTING MOLDS Fil ed Deb. 10, 1923 INVENTOR Btzm ATTORNEY Patented Apr. 28, 1925.

UNITED STATES 1,535,186 PATENT OFFICE.

JOHN T. STONEY, 0F LAKEWOOD, OHIO.

CORE FOR CASTING MOLDS.

7 Application filed December 10, 1923. Serial No. 679,604.

struction of cores for castings generally and to the construction of combined dry sand and green sand cores particularly.

The object of my invention is an eificient core means to facilitate and speed up the production of castings.

Cores for castings are generally made as dry sand cores which means that these cores are made up of greencore sand andare then baked so that they can be handled and placed into the mold without breaking or otherwise deforming or' injuring them.

Such procedure requires considerable time for baking as well as expense for heat, handling, etc. Furthermore, the sand used for such dry cores must be mixed with some binding agent so that the core will not break up after baking. After such a dry core has been used for casting purposes, the heat of the casting burns up this binding agent and leaves a residue as ash which renders this sand useless for further casting purposes. These bakedcoresare'also much more difficult to remove from a! casting than green sand cores. The present invention aims to eliminate these dry sand cores and substitute therefor green sand cores which are easily removable from the casting, require no baking, and the sand of which can be used again for casting purposes.

In the present invention I propose to use one portion of the core made of green sand and the other portion of dry sand. Both portions of the core may be made of green sand but I find that a new invention is involved in making both portions of green sand which requires a separate application for patent.

The present'invention is illustrated in the accompanying drawing which shows a core structure made in two halves for the cylinder of an internal .combustion engine which structure constitutes one embodiment of my invention but is susceptible to changes and modifications. In this drawing, Fig. 1 is a perspective view of the top portion of a casting mold with the dry sand half of the core in place and the jig on the mold all ready to receive the green sand half of the core; Fig. 2 is a perspective view similar to Fig. 1 with the green sand half of the core in place over the dry sand half of the core; Fig. 3 is a perspective view of the green sand half of the core showing the arbor impressed in the sand; Fig. 4 is a the arbor Fig. 5 is a section, taken on the line 5 indicated in Fig. 3, showing the transverse relation between the arbor and the green sand half of the core and the typical formation of the arbor scale; Fig. .6. is a perspective view of the green sand half of the core with the handles in place ready for superimposing over the dry sand half of the core; Fig. 7 is a sec tion, taken on line 7'7 showing the longitudinal relation between the arbor and the green sand half of the core; Fig. 8 is a section, taken on the line 88 indicated in Fig. 4:, formation of the arbor scale.

Similar reference characters refer to 'similar parts throughout the views. Y

The casting mold shown in the accompanying drawing comprises, flask A, the dry sand half of the core B, the green sand half of the core C, the jig D, and the arbor E.

The flask A may be of any suit-able construction and is provided with the holes 10 for the index pin 11 which is secured to the jig D. As at present advised, I first make the mold in the flask in a determined relation to theholes 10 for the purpose appearing presently.

The dry sand half B is thenmade in the usualmannerand is then placed into this mold in the usual manner as seen in Fig. 1.

members on a larger perspective view of members on a larger showing the typical indicated in Fig. 3,"

principally, the i The green sand half C, however, must be ent instance, the arbor E composed of the 1 members 12 and 13 extending into the cylinder'portions 14 and15, respectively, the members 16 and 17 located in the upper portion of the crank case portion 18 of the core, the membersl9, 20, 21, and 22 6X tending downward from the members 16 and 17 through the portion 18, and the member 23 connecting the members 19, 20, 21

and 22 and disposed along the outer end of the core print 24. The members 12 and 13 extend to theouter end of thec'ore prints and each is provided with an aperture 2'6 to engage a handle as will appear presently.

The member 23 extends to the outeren'd of i wise formedor deformed to facilitate the adherence of the sand thereton As seen in F gs. 3, 6, and 7, this arbor either while the. core lis being made or afterward, so that the surfaces 28 thereof are disposed in the same plane as the surfaces 29 which here represents the parting of the mold and ofthe core. c

. It isunderstood, however, that the arbor may be completely embedded in the sand; the manner of impressing the arbor in the sand as shown in the drawing is most convenientfor either machine or for hand production of cores and the flat surfaces 28 afford a substantial support for the green sand cores on the drysand cores.

, Since the arbor is made of one piece, it 30, forms a rigid core unit of its own and supports and connects and stilfens all portions 7 of this green sand core, so that the. same can be handled readily and without injury thereto. This arbor structure has the fur- .ther advantage of presenting metal surfaces on the. outside of the core where a substanhtial handling means can take hold of it without contacting the green sand.

the other 7 upon the core C can be handled without is impressed into the reen sand half C,

[sand thereof.

lt. is observed that the members ,of the present arbor are so arranged that the arbor vas a wholecan readily be withdrawn from v the coreafter thecasting is poured so that such arbors can be used again for core purposes. M

The V rooves 30 are provided in the member 23 in certain relation to the core C.

The jig dles 32 on each end/thereof. The pins 11 locate this jig on the moldv in certainposition as, previously mentioned and conse quently also locates it in certain relationto the core which is located bytne core prints of theimold. The inner'edgeof the body 31 isprovided with the fiat gauge surfaces 33 so located that the end of the core print 24 abuts thereon when the core C is in proper position in relation to the mold and the core B.

From these fiat surfaces 33 extend the V -,projections 3d spaced in the same relation to the core C as the V grooves 30 so that these. grooves 30 abut the respective, V projections 34 when the core is in proper place. 'The core C is located in one direction by the surfaces 33 and in the other direction and these portions provided with to permit of taking hold of said D has the body 31 with the han- I 3. In combination, a casting mold, a di- Qvided core comprising one portion composed of dry sand contacting the sand thereof.

It isobserved that, with the present inven'tion, no part of the arbor projectsbe- ,yond the boundaries of the core, that the arbor can readily be taken hold, of for the purpose of handling the core, that the core can be made in the usual core-box without any special provisions for accommodating the arbor, and that no special provisions are required on the flank to accommodate the arbor. j i The present invention is illustrated ina mold for a simple cylinder casting butis applicable to other castings.

lVithout limiting myself to the precise construction and arrangements shown and described, i

1. A cor for acasting mold having an arbor within the boundaries of said core; portions of said arborextending to the en provided with apertures to of said coreand permit of taking holdfof said arbor for handling said core without contacting the for a casting mold, provided 2. A core with oppositely disposed core prints, an

arbor in said core and portions thereof projecting through said core prints and the ends of these projecting portions within the. boundaries of the ends of said coreprints apertures arbor for handling said core without contactingthe sand thereof.

and placed in said mold in the usual manner, and the other portlon composed of green sand and provided with thereof means for superimposingthe same over the first said portion without contacting said green sand; said means comprising, an arbor impressed in said green sand andftheends flush with the ends of said other portion and provided withapertures to permit of taking hold of said arbor for handling 125 said other portion without contacting the sand thereof.

4.111 combination, a castmg mold, a divided core comprising one portion composed of dry sand and placed 1n said mold lnthe usual manner, the'other portion composed of green sand and provided with means for superimposing the same over the first said portion Without contacting said green sand, and means for locating said other portion in relation to said first portion; said locating means comprising, a jig for said mold and provided with means for locating the same in certain relation to the first said portion of the core and provided With means for guiding said other portion, and means on said other portion for contacting said guiding means on said jig.

5. In combination, a casting mold, a divided core comprising one portion composed of dry sand and placed in said mold in the usual manner, the other portion composed of green sand, an arbor impressed in said green sand and provided with means for taking hold thereof, a jig provided with means for locating the same on said mold in certain relation to the first said portion of the core and provided with means of guiding said other portion, and means on said other portion for contacting said said jig.

6. In combination, a casting mold, a divided core comprising one portion composed of dry sand and placed in said mold in the usual manner, an other portion composed of green sand, an arbor impressed in said green sand and portions thereof extending to the ends of said one portion and being flush therewith, each extending portion provided with apertures to engage a handling means, a jig provided with means for locating the same on said mold in certain relation to the first said portion of the core and provided with means for guiding said other portion of the core, and means on said other portion for contacting said guiding means on said JOHN T. STONEY.

guiding means on 

